Replace N-Triple StreamReceiver with StreamPipe/Encoder and Tee

This retains the current test behaviour (output to file and stdout)
and allows the N-Triple conversion to be used with the `encode`
pipe element in Metaflow workflows: encode("n-triples").
Configure all-in-one Jar dependency for Metatext Eclipse bundle

With `mvn clean assembly:assembly` a Jar containing all lodmill-rd
dependencies is created, which is used by the Metatext Eclipse
bundle. The properties files currently don't end up in the
resulting Jar (they are overwritten by others in the dependencies).
They need to be copied manually into the Jar to make the Metaflow
workflows run when executed with Metatext in Eclipse.
Add sample transformation from MARC-XML to N-Triples with Metaflow

This can be used as a self-contained transformation with Metatext
in Eclipse (install in Eclipse from http://lobid.github.com/p2/,
choose Run -> Run As -> Metatext Workflow on the *.flow file).
Tweak pom.xml, settings.xml, and .travis.yml to fix build timeouts

Build with `mvn clean install --settings settings.xml` or copy
settings.xml to ~/.m2 and build with `mvn clean install`.
Merge pull request #21 from fsteeg/triple-flow

Allow N-Triple conversion in Metaflow workflows